Improvement in sewing-machines



4 C. N. FARR.

Sewing Machine. A

Patented Aug. 9, 1859.

UNITED STATES PATENT ()FFICE.

CHESTER N. FARR, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN SEWlNG-MACHINES.

Specification forming part of Letters Patent No; 25.004, dated August 9,1859.

To all whom it may concern:

I Be it known that I, OHEsTER N. FARR, of Philadelphia, in the State ofPennsylvania, have invented and applied to use certain new and usefulImprovements in Sewing-Machines; and I do hereby declare that thefollowing is a full, clear, and exact description of the constructionand operation of the same, reference being had to the annexed drawings,making part of this specification, wherein Figure l is an inverted planof my sewingmachine, and Fig. 2 is a side view of the same with the bedand cam-box in section.

Similar marks of reference denote the same parts.

lWIy said invention relates to the manner of adjusting and controllingthe motions of a looper which enters the loop of needle-thread and thencrosses the needles path when said needle has risen, so that on theneedle again descending it takes a loop of second thread on the oppositeside of the looper, and said looper, retiring, drops the loop ofneedlethread around the loop of second thread and then moves laterally,and again passes on the other side of the needle and takes a loop, andproceeds as before.

In the drawings, a is the bed; b, the cambox; 0, the fly-wheel to whichpower is to be applied to rotate the main shaft (1. c is the arm thoughwhich said shaft 1 passes and gives motion by a cam or crank to theneedle barf. g is the presser-foot, and h is the spool of needle-thread'These parts may be of any desired construction, as my intention does notrelate to them.

On the shaft (1 four cams, 1 2 3 4, are provided, the first two actingon the feeding device and the last two on the looper.

k is a lever set on a fulcrum-pin, 5, at which point a slot in saidlever allows of a vertical as well as vibrating. motion. The lower endof this lever enters a lever, m, beneath the bed a, which lever is 011 acenter pin, 6, the hole for which is slightly elongated to allow thehereinafter specified motions to be given said lever.

a n are the feeding-fingers,with teeth on their surfaces working throughslots in the bed a, to feed the cloth. 4

Z is a retracting-spring, tending to keep the fingers it away from thecloth. In revolving the shaft d the cam 1 comes in contact with the armn, sliding the lever is on its fulcrum 5 and striking the fingers itagainst the cloth. The cam 2 then gives a sidewise movementrto thelevers 7c and m, feeding the cloth. The cam 1 then ceasing to operate,the spring Z first draws. the fingers it away from the cloth, and thenbrings the parts back to the place of beginning as the cam 2 ceases toact. A screw, 00, acting at the end of the arm a, regulates the approachof the lever 70 to the cam 2, and consequently 'the length of thestitches.

0 is a lever on a fulcrum-pin, 7, that passes with a rocker-piece, 8,that is also on the fulcrum-pin 5, so that the upper end of the lever 0receiving a compound motion from the cams 3 and 4, said lever is free tomove forward and back or sidewise, or both, 'on the pin 5 and stud 7.The lower end of this lever passes into the looping-bar 1), that isretained and ad justed by the fulcrum piece 1- and stops (1 s.

t is a retracting-spring that keeps the upper end of the lever 0 againstboth cams 3 and 4.

a is the looper at the end of the bar 1).

t is the spool of second thread,which leads through a hole in thecam-box b, and an eye or guide, 10, to the eye 9 of the looper; and w isa guide-plate, against which the needle passes to steady the same. Thisis shown as turned back in Fig. 1 to show the looper.

The operation of these parts is that the cam 4 vibrates the lever 0 onthe fulcrum-stud 7, and gives the looper and bar a sliding motion.through the guides q r s, and the cam 3 gives the looping-bar p avibrating motion 011 the guide 1-, which becomes a fulcrum, causing thelooper 1o to cross the needles path. The shape of the cams 3 4 is suchthat the looper passes into a loop of needle-thread, as seen in Fig. 1,the needle draws up, the looper crosses its path, leading the loop ofsecond thread into the position shown in Fig. 3, (blue lines,) to betaken by the needle on its next descent. Then the lo'oper draws back,dropping the loop of needle-thread (shown in red lines) around the loopof second thread, crosses to its former position, and then goes forwardand takes a new loop of needle-thread, and proceeds as before. Thefulcrum-slide r is to be properly adjusted and then the stop q so placedthat when the spring 25 draws the looping-harp back against said stop qthe looper a shall be in position correctly, as seen in Fig. 3, andwhenthe said lever 12 comes in contact with the stop 8 the looper shallbe correctly in position to take the loop of needle-thread, as seen inFig. 1, so that by this very simple arrangement of devices'th'e looperis adjusted with great facility and regulated in its motions so as totake the loops of needle-thread and properly place the loop of thesecond thread to be taken by the needle.

I do not claim a looper that crosses the path of the needle, so as towork on opposite sides of said needle, as that has before been used.

hat I claim as my invention, and desire to secure by Letters Patent, is

- justcd as described, the rocking-lever 0, fitting and acting asspecified.

In witness whereof I have hereunto set my signature this 14th day ofOctober, 1858.

CHESTER N. FARR.

Witnesses:

ALVAN FARR, J OHN W. TAGGART.

